Answer: if 5N is applied for 5 seconds then it would move at a constant speed for one second then decrease in speed
A ball is thrown vertically upwards from the ground with an initial velocity of 50m/s. What is the total time by the ball to get its maximum height? (take g=10)
A. 500s
B. 50s
C. 5s
D. 0.5s
Explanation:
initial velocity (u) = 50m/s
final velocity (v) = 0m/s
i.e the ball stops for a while at its maximum height.
g = 10m/s^2
from the 1st equation of vertical upward motion:
v = u - gt
hence t = (v + u)/t
t = (0 + 50)/10
t = 50/10 = 5s.
C. 5s.
Answer:
c
Explanation:
(a) Initial velocity of ball (u)=50m/s, acceleration of ball =−g,
final velocity at the highest point (v)=0
So applying the 3rd equation of motion we get:
v
2
=u
2
−2gh
max
⇒0=50
2
−2×10×h
max
⇒h
max
=
20
2500
=125m
(b) Let the time required to reach max height be t. Then applying 1st equation of motion we get:
v=u−gt
⇒0=50−10t
⇒t=5s
(c) Let speed at half of max height be V then:
V
2
=50
2
−2g
2
125
⇒V
2
=2500−1250=1250
⇒V=
1250
=35.35m/s.
How does temperature effect density and the flow of convection currents?
Answer:
Convection
Explanation:
Convection is heat transfer due to a density differential within a fluid. As water's temperature increases in the presence of a heat source, it will become less dense and rise. As it moves up and away from the heat source, it cools and becomes more dense and sinks.
What is the density of the paint if the mass of a tin containing 5000 cm3 paint is 7 kg. If the mass of the empty tin, including the lid is 0.5 kg.
We are given:
Mass of the Paint bucket (with paint) = 7000 grams
Mass of the paint bucket (without paint) = 500 grams
Volume of Paint in the Bucket = 5000 cm³
Mass of Paint in the Bucket:
To get the mass of the paint in the bucket, we will subtract the mass of the bucket from the mass of the paint bucket (with paint)
Mass of Paint = Mass of Paint bucket (with paint) - Mass of the paint Bucket (without paint)
Mass of Paint = 7000 - 500
Mass of Paint = 6500 grams
Density of the Paint:
We know that density = Mass / Volume
Density of Paint = Mass of Paint / Volume occupied by Paint
Density of Paint = 6500/5000
Density of Paint = 1.3 grams / cm³
A spring is hanging from the ceiling. When a 250 gram of mass is attached to the free end, the spring elongates by 5 cm. The spring constant (in N/m) is:
Answer:
k = 49 N/m
Explanation:
Given that,
Mass, m = 250 g = 0.25 kg
When the mass is attached to the end of the spring, it elongates 5 cm or 0.05 m. We need to find the spring constant. Let it is k.
The force due to mass is balanced by its weight as follows :
mg=kx
[tex]k=\dfrac{mg}{x}\\\\k=\dfrac{0.25\times 9.8}{0.05}\\\\k=49\ N/m[/tex]
So, the spring constant of the spring is 49 N/m.
The modulus of elasticity for a ceramic material having 4.7 vol% porosity is 317 GPa. (a) Calculate the modulus of elasticity (in GPa) for the nonporous material.
Answer:
The answer is below
Explanation:
a) Given that the modulus of elasticity (E) = 317 GPa, to find the modulus of elasticity (in GPa) for the nonporous material ([tex]E_o[/tex]), we use the formula:
[tex]E_0=\frac{E}{1-1.9P+0.9P^2}\\\\where\ P=4.7\%=0.047,hence:\\\\ E_0=\frac{317}{1-1.9(0.047)+0.9(0.047)^2}\\\\E_0=347.3\ GPa[/tex]
b) If the porosity P = 11.1%, then the modulus of elasticity is:
[tex]E=E_0(1-1.9P+0.9P^2)=347.3(1-1.9(0.111)+0.9(0.111)^2)=278\ GPa[/tex]
. Are there human health risks from exposure (or overexposure) to X-rays? If so:
• describe the main risk(s)
• describe common sources of exposure (or overexposure)
• describe a technology, device, or behavior that can be used for protection, or to decrease exposure
- large doses may lead cells to be cancerous
- causes mutations in the DNA
describe common sources of exposure ( or overexposure ) :::- natural background radiation e.g. - cosmic rays
- medical radiation e.g. - CT scans & medical x - rays
- man - made radiation e.g. - airport security scanners
describe a technology, device, or behavior that can be used for protection, or to decrease exposure :::- x - ray beam filters
- digital x - ray detectors
- technologies reduce radiation doses in radiography &
mammography
hope that helps !!
Yes, there are human health risks caused by exposure to x-rays, X-rays may cause damage to cells in the body, and large doses may lead cells to be cancerous, causing mutations in the DNA.
What are X-rays?X-rays are electromagnetic waves with minimal wavelengths and high frequencies. Their wavelengths typically range from 10⁸ to 10¹² meters, and their corresponding frequencies are typically between 10¹⁶ and 10²⁰ hertz (Hz).
Charged particles are frequently accelerated (or decelerated) to produce X-rays; examples include an electron beam striking a metal plate in an X-ray tube and an electron beam circulating in a synchrotron particle accelerator or storage ring. The energy level spacing in the atoms can also be used to determine the discrete wavelengths of X-rays that highly excited atoms can emit.
X-rays may cause damage to cells in the body, large doses may lead cells to be cancerous, causing mutations in the DNA.
Common sources of exposure (or overexposure) :
Natural background radiation, e.g. - cosmic rays.Medical radiation, e.g. - CT scans & medical x-rays.Man-made radiation, e.g. - airport security scanners.The technology, device, or behavior that can be used for protection, or to decrease exposure are:
X-ray beam filters.Digital x-ray detectors.Technologies reduce radiation doses in radiography & mammography.To know more about X-rays:
https://brainly.com/question/2833441
#SPJ2
A solid keeps its shape due to which of the following factors?
Space between particles
Attractive forces between particles
The type of element in the solid
The container it is placed in
Answer:
c
Explanation:
because whatever elements are used like gas uses water evaporation so yeah
Answer:
(A) Space between particles!
Explanation:
Solids can hold their shape because their molecules are tightly packed together!
✞ Bye Have A Nice Day! ✞
Which factors affect the rate of deposition? Check all that apply.
color of the sediment
density of the sediment
size of the sediment
texture of the sediment
velocity of the agent of erosion
Answer:
density of the sediment, size of the sediment, and velocity of the agent of erosion.
Explanation:
Have a nice day!
Answer: b., c., e.
Explanation:
5. The most dangerous place to use electrical equipment is?
A) indoors
B) outdoors
near water
D
near other electrical equipment
Answer:
c near water
Explanation:
because well let's say you were out in the rain or ur at an outdoor pool swimming and all of a sudden lighting strikes the water while ur in it...... then you would barely be living bc electric touched water
which two conditions would result in the strongest electric force between charged objects
Answer:
A and B
Explanation:
The two conditions which results in the strongest electric force between charged objects are when they close together secondly, when the objects are conductors with balanced charges.
What is electric force ?Electric force is the force generated between charged bodies. There are both repulsive and attractive electric forces. Like charges exerts a force of repulson between each other. Unlike charges will exert an attractive force between each other.
According to Coulomb's law of electric forces is directly proportional to the magnitude of charges and inversely proportional to the distance between them. Thus , when the objects are closer the greater force is exerted between them.
Insulators does not allow flow of free electrons and the electric force between them is weak. Whereas, when two conductors of unlike charges exerts strong electrostatic force of attraction. Hence, option B and C are correct.
Find more on electric force:
https://brainly.com/question/29141236
#SPJ2
How does cold water affect the speed of dissolving?
A. Cold water slows down dissolving
B. Cold water speeds up dissolving
C. Cold water has no effect on dissolving
D. Cold water completely stops dissolving
Answer:
Cold water slows down dissolving
Cold water slows down dissolving. Hence, option (A) is correct.
What is the relationship between the solubility and the temperature?The basic relationship between solubility and temperature is as follows: A solid will dissolve more readily at higher temperatures.
Likewise, a solid element dissolves more slowly at lower temperatures. This is all due to the solvent becoming more and more excited by the heat, making it easier for it to split or break apart entirely.
for while in gases The solubility of gases decreases more rapidly as temperature rises. A gas is more soluble in water when the temperature is lower.
Henry's law, which states that the gas becomes more soluble as the pressure above the liquid solution increases, summarizes another characteristic of gas solutes.
Learn more about solubility here:
https://brainly.com/question/29661360
#SPJ2
Ken Griffey, Jr's warehouse shot in the 1933 home run derby travelled 93 feet per second for 5 seconds. How far did he hit the ball?
Answer:
465 feet because 93*5 = 465, btw that was 1993 not 1933
Explanation:
30 points! to who helps me out
When are zeros significant when found in front of (to the left) of the decimal point?
Answer:
If a zero is found between important digits, it is important. Zeros are also used as (not salient) holders to the left of digits if the number is in fact a decimal. Example from www.rpi.edu: , a mass of 42 g has two significant digits. Expressed in kilograms, the mass of 0.042kg should still have two significant digits.
Explanation:
Zeros are also used as (not salient) holders to the left of digits if the number is in fact a decimal. Example from www.rpi.edu: "A mass of 42 g has two significant digits. Expressed in kilograms, the mass of 0.042kg should still have two significant digits."
Hope this comes in handy, have a great day!
Pablo and Charles were conducting an investigation where they were measuring the energy of a glass marble as it rolled down a ramp. According to their calculations, the total energy of the marble decreased.
Which statement below is the best explanation for the decrease in total energy?
Answer:
it will be B
Explanation:
Answer:
The energy decreased because heat resulted from the friction between the marble and the ramp.
Explanation:
I think its this answer because i think is has somthing to do with friction
Rocks that do not allow water to pass through them are said to be impermeable. True or false?
Answer:
true plz mark me as the brainliest
Explanation:
Answer:
TrueSome rocks have pores in them, which are empty spaces. If these pores are linked then fluid can flow through the rock.However,if the pores are not linked,then no liquid can flow through the rocksWhen pores are not linked,the rock is permiable.n
John doe gets on the highway in his 1967 Shelby 427 Cobra starting from the dead stop at the bottom of the on ramp of it can be assumed that John accelerates at a rate of 6.7 m s2 how long does it take for John to reach the speed of 30 m s?
Answer:
It will take john 4.477 seconds
Help !! I hate science
Answer:
iron nail rusting
Explanation:
Lab report of experimrnt to find the series resonance of acceptor circuit and parallel resonance of rejector circuit in RLC?
Answer:
afgiknvdeyiknvxwtuinvdruincdyukn
If an object is traveling in a straight line moving East then the following is true.
A distance is equal to displacement
B distance is greater than the displacement
C distance is less than the displacement
D distance is a value and displacement is equal to 0
Answer:
A distance is equal to displacement
Explanation:
An object traveling in a straight line moving East will have its displacement value to be equal to the distance.
Displacement is the distance traveled in a specific directions.
Distance is the total length of path traveled.
The displacement of the object is the value of the distance due east.
The distance is the value of the length of path covered.
A trip is taken that passes through the following points in order
Point A 0 m
Point B 15.0 m
Point C -30.0 m
Point D -20.0 m
Point E 10.0 m
Point F 5.0 m
What is the distance from Point C to Point F?
Answer:
35, I got you bro, i got you
carter found the rock shown in the picture below near a river
Answer:
there's no picture
Explanation:
and what would the question be anyways?
Answer:
what is the question
Explanation:
why cant halleys comet be seen from earth only for about one year of its 76-year orbit
Answer:
Halley's comet will next appear in the night sky in the year 2062. It orbits the sun every 75-76 years, so this is the time between appearances.
A box is being pushed by two stellar science students, one on each side of the box. Delfino is pushing
the box with a force of 10 N to the left. Aleida is pushing the box with a force of 15 N to the right. Who is
the stronger individual and what is the net force and direction on the box.
Explanation:
It is given that,
Delfino is pushing the box with a force of 10 N to the left. Aleida is pushing the box with a force of 15 N to the right.
Aleida is exerting more force. He is the more stronger individual.
Net force is given by :
F = -10+15
F = 5 N
So, the net force is 5 N and it is in right direction.
The elements of art were created by artists based on things we see in real life. For example, texture on trees or the order of colors in the rainbow.
Question 1 options:
True
False
Answer:
true
Explanation:
just took the best its true
Answer:
True
Explanation:
I took the quiz and got it correct
Do someone know the answer
g A ring and solid sphere are rolling without slipping so that both have a kinetic energy of 126 J. What is the rotation kinetic energy of the ring
Answer:
63J
Explanation:
The question tells us that they both have a kinetic energy of 126 J. What we are required to get is the rotation kinetic energy of the ring
Total kinetic energy =
1/2mv² + 1/2IW²
For ring,
I = mr²
And v = Rw for pure rolling
The total kinetic energy
= 1/2mr² + 1/2mv²
= 126J
126/2
= 63J
The rotational kinetic energy of the ring is therefore 63J.
Thank you!
A heavy bank-vault door is opened by the application of a force of 300 N directed perpendicular to the plane of the door at a distance of 0.80 m from the hinges. What is the torque?
Question 4 options:
1.) 120 Nm
2.) 240 Nm
3.) 375 Nm
4.) 300 Nm
Answer:
240Nm
Explanation:
Given parameters:
Force on the bank vault = 300N
Distance to the plane of the vault = 0.8m
Unknown:
Torque = ?
Solution:
Torque is the component of force that causes an object to rotate about an axis;
Torque = Fr x sinФ
Here Ф = 90°
r = distance
Torque = 300 x 0.8 x Sin 90°
Torque = 240Nm
explain four contributory factors of unequal access to basic resources
Answer:
Answer. The big five factors of poverty (as a social problem) include: ignorance, disease, apathy, dishonesty and dependency. These, in turn, contribute to secondary factors such as lack of markets, poor infrastructure, poorleadership, bad governance, under-employment, lack of skills, lack of capital, and others.
In an experiment, a research collected the following informationabout a solution made from a certain
food. What can we conclude about the food?
• pH = 3.0
• Taste = Sour
A. Acid
B. Base
C. Neutral
D. Salt
Answer:
salt
Explanation:
